<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>实验2_1</title>
		<link rel="stylesheet" href="实验2_1外部样式.css" />
		<style>
			div {
				color: green;
			}
		</style>
	</head>
	<body>
		<div style="background-color: skyblue;">第一段</div>
		<div style="color: pink;">第二段</div>
		<div>第三段</div>
	</body>
</html>